One person was killed and two people were injured in an assault and shooting outside a Shawnee Walmart store Sunday afternoon.

The shooting happened about 1:30 p.m. at the Walmart store near Shawnee Mission Parkway and Maurer Road.

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Police said a woman left the store and was putting her infant child in a car seat when two men she didn't know approached her and one struck her on the head.

Investigators said a man got out of his car to help the woman and was shot multiple times. They said another man saw what happened, got out of his car and shot one of the attackers dead.

Police said the second man ran off. Police originally believed they captured the second suspect using a K-9 officer, however, that person was not connected with the incident. Police are working to identify the second suspect at this time.

The good Samaritan who was shot and the woman who was injured were both initially listed in critical condition. The woman has since been released from the hospital. The good Samaritan who was injured had surgery Sunday night. He is being identified only as a 33-year-old Kansas City, Missouri resident. The second good Samaritan, a 36-year-old DeSoto, Kansas man, was interviewed by police and released.

"You know our hearts and prayers go out to both of them for a speedy recovery. I know we have many people out right now, many teams of officers and detectives. We had to make contact with the family of good Samaritan number one to get them to the hospital to be with him, but apparently good Samaritan number one is able to talk," said Maj. Dan Tennis, of the Shawnee Police Department.

The suspect who was killed has been identified as John W. Simmons III.